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1 Bulletin of the Polish Academy of Sciences. Technical Sciences

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Mid-wave InAs/GaSb superlattice barrier infrared detectors with nBnN and pBnN design

Gomółka E., Markowska O., Kopytko M., Kowalewski A., Martyniuk P., Rogalski A., Rutkowski J., Motyka M., Krishna S.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2018

Vol. 66, nr 3

317--323

We present an investigation of optical and electrical properties of mid-wavelength infrared (MWIR) detectors based on InAs/GaSb strained layer superlattices (SLs) with nBnN and pBnN design. The temperature-dependent behavior of the bandgap was investigated on the basis of absorption measurements. A 50% cut-off wavelength of around 4.5 μm at 80 K and increase of up to 5.6 μm at 290 K was found. Values of Varshni parameters, zero temperature bandgap E0 and empirical coefficients α and β were extracted. Arrhenius plots of dark currents of nBnN and pBnN detectors were compared with the p-i-n design. Dark current density reduction in nBnN and pBnN detectors is observed in comparison to the p-i-n device. This shows a suppression of Shockley-Read-Hall (SRH) processes by means of introducing barrier architecture.